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Post subject: RE: hardware na cca 20km
 Posted: 16.07.2008 - 22:52 #67179
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Majster
Joined: Máj 12, 2004
Posts: 4579
Location: Bratislava
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| musis sa vsak mestit do 30dB komplet... |
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Post subject: RE: hardware na cca 20km
Posted: 16.07.2008 - 22:55 #67180
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Basic
Joined: Mar 13, 2004
Posts: 226
Location: Maly Cepcin
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421> citujem z datasheetu:
6Mbps -94 dBm
9Mbps -93 dBm
12Mbps -91 dBm
18Mbps -90 dBm
24Mbps -86 dBm
36Mbps -83 dBm
48Mbps -77 dBm
54Mbps -74 dBm
btw zatvorke som uviedol aj pre aku rychlost udavam tu citlivost...
Chalan> ano ten vypocet bol presne v limite...
TX som uvadzal 30dB (24dB antena + 8dB karta - 2dB straty) preto len taka mala rezerva na tom spoji... ziarit 37dB(5W) aby tam bola dostatocna rezerva nechcem  |
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Post subject: RE: hardware na cca 20km
Posted: 16.07.2008 - 23:21 #67182
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Majster
Joined: Okt 31, 2006
Posts: 2062
Location: TT
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| radšej tyam daj 29 dbi antenu a kartu zreguluj na 2-3 dBi , získaš tak dalších 5 dBi na zisku |
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Post subject: RE: hardware na cca 20km
Posted: 16.07.2008 - 23:40 #67184
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Basic
Joined: Mar 13, 2004
Posts: 226
Location: Maly Cepcin
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Aby sme sa chapali tak presne popisem spoj:
mikrotik nstreme2 dual: alix 2c2
TX: R52 (8dB) + JRC-24 dBi - straty(2dB) = 30dB
RX: XR5(SR5) citlivost pri 24Mbps (-86) + PAWDA57-32 - straty(2dB) = -76 (rezerva spoja je cca 9dB)
Thomas stale mas pocit, ze ak tam dam 29dB na vysielanie ziskam dalsich 5 dB? Podla mna je jedno ci vysielam 24+8-2 alebo 29+3-2 samozrejme ked sa to spravne zameria. |
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Post subject: RE: hardware na cca 20km
Posted: 16.07.2008 - 23:44 #67185
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Guru
Joined: Jan 24, 2004
Posts: 1685
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Saigon wrote: ›Aby sme sa chapali tak presne popisem spoj:
mikrotik nstreme2 dual: alix 2c2
TX: R52 (8dB) + JRC-24 dBi - straty(2dB) = 30dB
RX: XR5(SR5) citlivost pri 24Mbps (-86) + PAWDA57-32 - straty(2dB) = -76 (rezerva spoja je cca 9dB)
Thomas stale mas pocit, ze ak tam dam 29dB na vysielanie ziskam dalsich 5 dB? Podla mna je jedno ci vysielam 24+8-2 alebo 29+3-2 samozrejme ked sa to spravne zameria.
to nemas absolutne jedno - preco potom vsetci nepouzivaju male 17dBi antenky a neziaria 13dBm?
zober si v uvahu prijimacie casti. tym, ze tam das ziskovejsie anteny, pribudne par dB k dobru... |
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Post subject: RE: hardware na cca 20km
Posted: 16.07.2008 - 23:45 #67189
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Majster
Joined: Okt 31, 2006
Posts: 2062
Location: TT
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Post subject: RE: hardware na cca 20km
Posted: 17.07.2008 - 00:36 #67195
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Basic
Joined: Mar 13, 2004
Posts: 226
Location: Maly Cepcin
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24dB som volil hlavne kvoli cene a velkosti...ale oki mate pravdu aj tak ten spoj je dost na hrane
btw: rezerva spoja je 20dB ale ak ten spoj nepojde aspon 20Mbps FD nema zmysel ho robit. |
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Post subject: RE: hardware na cca 20km
Posted: 17.07.2008 - 08:59 #67203
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Majster
Joined: Máj 12, 2004
Posts: 4579
Location: Bratislava
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| lenze tym vacsim ziskom anteny si pritiahnes aj viac sumu... |
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Post subject: RE: hardware na cca 20km
Posted: 17.07.2008 - 10:12 #67205
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Basic
Joined: Mar 13, 2004
Posts: 226
Location: Maly Cepcin
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Chalan wrote: ›lenze tym vacsim ziskom anteny si pritiahnes aj viac sumu...
Na prijem je jasna PAWDA57-32 (mozno silnejsia ak sa podari zohnat) vzhladom na vzdialenost pouzit slabsiu nie je mozne...
A ani to ze silnejsou si pritiahnes viac sumu nemusi byt vzdy pravda. Ak vo vyzarovacom uhle je nejaky sum, tak ho krasne zosilni, no ak je mimo toho uhla, tak by viac sumu chyta slabsia s vacsim vyzarovacim uhlom... |
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Post subject: Jednoduche riešenie
Posted: 06.10.2009 - 11:43 #75721
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Basic
Joined: Feb 27, 2009
Posts: 6
Location: Ožďany
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2 x WAVEANT: WA26-5xP 26 dBi parab. anténa (5 GHz)
2x UBIQUITI: Bullet M5 AirMax MIMO - 100 Mbps AP/klient 5 GHz, 1x LAN
A máš fajny spoj mam to spustene a a prenašam realne 50Mbit/s Down a 50 Mbit/s UP Load |
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Post subject: RE: hardware na cca 20km
Posted: 06.10.2009 - 14:39 #75732
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Basic
Joined: Sep 21, 2009
Posts: 86
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| nastavenie default predpokladam. co vzdialenost? |
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